Propelling device



Jufly i, 1946. M. FALK I PROPELLING DEVICE Filed Aug. 23, 1945 2Sheets-Sheet l INVENTOR.

ATTORNEY.

uHy E6, 1946. M. FALK PROPELLING DEVICE Filed Aug. 25, 1945 2Sheets-Sheet 2 INVENTOR. 7

ATTORNEY.

Patented July 16, 1946 UNITED STATES PATENT OFFICE R PELLING DEVICE Marus Falk,Boston, Mass. Application August 23, 1945,-Serial No. 612,190

' l 4 Claims. (01. 170%141) This invention relates to a propellingdevice for a boat.

One object of my invention is to provide a new and useful propellingdevice-one that is protected and guided by the same mean during themajor part of its rotative travel.

The foregoing and other objects which will appear as the nature of theinvention is better understood, may be accomplished by a constructionand arrangement of parts, such as is disclosed by the drawings andspecification. The nature of the invention is such as to render itsusceptible to various changes and modifications, and, therefore, I amnot to be limited to said disclosure; but am entitled to all suchchanges therefrom as fall within the scope of my claims.

In the drawings:

Figure 1 is a top plan view of my propelling device attached to a boat,and

Figure 2 is a side elevational view of the same.

Figure 3 is a sectional view taken on the line -33 of Figure 2 andFigure 4 is a sectional view taken on the line 4-4 of Figure 2.

Figure 5 is a front elevational view of my device attached to the sternof a boat.

Figure 6 is an enlarged, perspective view of a propeller scoop or bladeshowing a fragment of the propeller body.

Figure 7 is an enlarged, perspective view of the propeller guide membermounted to a supporting bracket that is attached to a boat.

As illustrated, a propeller H) is associated with a stationary guidemember H! which is partly circular, being more than half but less than awhole circle. Its lower edge I 3 is horizontal or truncated or, atleast, there is a break in the continuity of the circle. Said propellingdevice has a circular disc-like body portion IS on the periphery ofwhich are blades or scoops l 6 which have a rear portion or back Iliaand a side lfib. Said body l5 serves as another side. Said scoops l6taper in depth as they curve inwardly towards said body portion l5 asshown in Figure 2 of the drawings. The inner surfaces of said scoops I6are closed to the peripheral surface of said guide member I2 and,therefore, its sides are lower, to avoid having said scoops I6 holdingany appreciable amount of water while they are located opposite saidguide member I'Z during the rotative movement.

Said guide member I2 is fixedly attached, as by welding, to a supportingbracket 18. Said bracket l8 may be attached to the stern of a boat B bybolts M. A stud I9 extends through said guide member l2, propeller bodyl5 and bracket 18-, said propeller body rotating on it. Said scoops iiiare outside of but rotate close to the rounded, peripheral surface ofsaid guide member l2, except when their path of rotation is below it,opposite said surface l3.

Fixed to said propeller body I5 is a stud 22 on which a connector head24 is mounted, to which head 24 a connecting rod 25 is fastened which inturn is actuated by a well known motor or the like, not shown, thusdriving said propeller H] by a crank-like motion which forcibly bringssaid scoops l6 into contact with the water as said body I5 is rotated,thus propelling the boat forward. To propel in a reverse direction saidpropeller I0 is rotated reversely and said back i511 pushing against thewater will cause a reverse movement of said boat B.

The number of scoops l6 carried by propeller body [5 may be varied,depending upon the size of said body IS, the speed desired, et cetera,and likewise their size may be varied.

The width of said guide member l2 at its rounded periphery, should be atleast equal to the width of a said scoop 16. If said guide memher ishollow its lower edge It shouldbe closed.

In operation, a motor actuates said connecting rod 25 which in turnrotates said propeller [0 by a crank-like motion which carries saidscoops I 6 into the water during part of their travel, thus driving theboat forward.

What I claim is:

l. A propelling device comprising a propeller embodying a body portionhaving a plurality of blades, at the periphery thereof, a guide memberassociated therewith having a portion of its peripheral surface curvedand a portion straight, means to support said member and propelleradapted to be connected to a boat, and means operatively connected tosaid propeller to rotate it, said blades being outside of, opposite toand adjacent said curved peripheral surface.

2. A propelling device comprising a propeller embodying a body portionhaving a plurality of scoops at the periphery thereof that extendlaterally beyond said body portion, a guide member having a portion ofits peripheral surface in the form of a partial circle and having anon-circular portion, said scoops being so positioned on said bodyportion with relation to said guide member curved peripheral surfacethat said scoops pass at a point outside of, adjacent and opposite tosaid circular surface, means to support said guide member and propelleradapted to be connected 3 r to a boat, and means operatively connectedto said propeller to rotate it.

3. A propelling device comprising a propeller embodying a body portionhaving a plurality of blades at the periphery thereof that extendlaterally beyond said body portion, said blades embodying a back, abottom and a side portion and being so positioned that a portion of saidbody provides a side for said blade opposite to but spaced from saidside portion, a guide member in the form of a partial circle that ismore than half a circle and whose lower edge is truncated, said scoopsbeing so positioned with relation to the curved portion of said guidemember that they pass at a point outside of, adjacent and opposite tothe peripheral surface of said circular portion, the width of theperipheral surface of 1 said circular portion of said guide member being4. A propelling device comprising a propeller embodying a body portionhaving four scoops at the periphery thereof, that extend laterallybeyong said body portion, said scoops embodying a back, a bottom and aside portion and being so positioned that a portion of said bodyprovides a side for said blade opposite to but spaced from said sideportion, said side portion tapering inwardly from said back, a guidemember in the form of a partial circle that is more than half a circleand whose lower edge is truncated, said scoops being so positioned withrelation to the curvedportion of said guide member that they pass at apoint outside of, adjacent and opposite to the peripheral surface ofsaid circular portion, the width of the peripheral surface of saidcircular portion of said guide member being as great as the width ofsaid scoops, means to support said guide member and propeller adapted tobe connected to a boat, and means operatively connected to saidpropeller to rotate it.

MARCUS FALK.

